降雨条件下大型滑坡体渗流稳定性分析

›› 2013, Vol. 34 ›› Issue (3): 833-841.

降雨条件下大型滑坡体渗流稳定性分析

张玉^{1, 2}，徐卫亚²，邹丽芳²，孙怀昆³

1. 中国石油大学(华东) 储运与建筑工程学院，山东青岛 266580；2. 河海大学岩土工程科学研究所，南京 210098； 3. 中水顾问集团昆明勘测设计研究院，昆明 650051

收稿日期:2012-01-17 出版日期:2013-03-11 发布日期:2013-03-20
作者简介:张玉，男，1985年生，博士，讲师，主要从事岩石力学与工程研究方面的教学与研究工作
基金资助:
国家自然科学基金和法国国家科研署联合基金项目(No. 50911130366)；江苏省科研创新计划(No. CX10B-205Z)

Analysis of seepage stability of large-scale landslide under rainfall condition

ZHANG Yu^{1, 2}，XU Wei-ya²，ZOU Li-fang²，SUN Huai-kun³

1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong 266580, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3. HydroChina Kunming Engineering Corporation, Kunming 650051, China

Received:2012-01-17 Online:2013-03-11 Published:2013-03-20

摘要/Abstract

摘要： 西南高山峡谷地区，大型滑坡体分布广泛，降雨作用下极易产生失稳。古水水电站争岗特大型滑坡堆积体方量高达4 750×104 m3，存在多处厚度超过50 m 的超深层滑坡。2008年强降雨导致滑体变形再次启动并加剧，依据野外勘测，首先对地质结构和水文条件进行了分析，基于此对降雨入渗机制和稳定性现状开展了定性评价，认为降雨引起了滑体材料强度降低，整体处于沿贯通底滑面蠕滑变形的状态，须开挖加固治理。其次，运用饱和非饱和渗流理论，对降雨条件下滑体开挖治理前、后渗流特性进行了定量研究，揭示了入渗引起滑动变形的动态机制，并对稳定性和治理措施进行了评价，提出了有效的排水措施。结果显示，入渗引起土体饱和，形成浸润线并出现滞水现象；治理前滑体局部和滑带处滞水严重，雨停4 d后，滞水层厚度最高达6 m，此时稳定性最差；治理后滞水层明显减小，稳定性显著提升。其结果真实地反映了滑体稳定性现状与规律，与现场勘查相吻合。治理措施亦有显著效果，依据滞水层分布位置，提出相关排水措施，更有利于保持其稳定性。研究成果可为类似工程问题提供有意义的参考。

关键词: 水电站, 大型滑坡堆积体, 降雨, 非饱和, 渗透特性, 稳定性, 排水措施

Abstract: The large-scale landslides, widely distributed in southwest mountains and canyons, are prone to produce instability due to rainfall. In Gushui hydropower station，not only is the extremely large volume of Zhenggang large landslide accumulation body up to more than 4 750×104 m3, but also the thicknesses of many ultra-deep landslide are over 50 m. Under the influences of the heavy rainfall in 2008, the landslide started to deform again and even more seriously. According to the results of field engineering geological investigation and analysis of geologic structure characteristics and hydrogeology conditions, the mechanism of rainfall infiltration and stability in the current situation was qualitatively analyzed first. Then the whole landslide was transfixed slipping surface in the state of creep deformation; so it should be treated such as excavating and reinforcing. Combined with the analysis result, quantitative study of the seepage properties of landslide showed the dynamic sliding mechanism that water infiltration caused deformation, evaluated the stability and treatment, thus proposed effective drainage measures before and after the treatment under the rainfall. The results also showed that the saturation line and backwater was formed due to saturated soil by infiltration. Before the treatment, the backwater was seriously persisted in local landslide and slip surface; and the worst stability came out 4 days later after the rain stopped; and the maximum thickness of backwater increased up to 6 m. However, with backwater reduced obviously, the stability was significantly increased by the treatment. The results truly reflected the situations and laws of the stability of landslide, which were consistent with the results of field exploration. The results were significantly improved by the treatment. Drainage measures proposed would keep the landslide’s stability efficiently. The research results will be useful and meaningful in the same projects as reference.

Key words: hydropower station, large-scale landslide accumulation body, rainfall, unsaturation, seepage properties, stability, drainage measure

中图分类号:

TV 698

张玉，徐卫亚，邹丽芳，孙怀昆 . 降雨条件下大型滑坡体渗流稳定性分析[J]. , 2013, 34(3): 833-841.

ZHANG Yu ，XU Wei-ya ，ZOU Li-fang ，SUN Huai-kun . Analysis of seepage stability of large-scale landslide under rainfall condition[J]. , 2013, 34(3): 833-841.

参考文献

相关文章 15

[1]	苏永华, 李诚诚. 强降雨下基于Green-Ampt模型的边坡稳定性分析[J]. 岩土力学, 2020, 41(2): 389-398.
[2]	程涛, 晏克勤, 胡仁杰, 郑俊杰, 张欢, 陈合龙, 江志杰, 刘强, . 非饱和土拟二维平面应变固结问题的解析计算方法[J]. 岩土力学, 2020, 41(2): 453-460.
[3]	方瑾瑾, 冯以鑫, 王立平, 余永强, . 真三轴条件下非饱和黄土的有效应力屈服特性[J]. 岩土力学, 2020, 41(2): 492-500.
[4]	邓子千, 陈嘉帅, 王建伟, 刘小文, . 基于SFG模型的统一屈服面本构模型与试验研究[J]. 岩土力学, 2020, 41(2): 527-534.
[5]	李潇旋, 李涛, 彭丽云, . 控制吸力循环荷载下非饱和黏性土的弹塑性双面模型[J]. 岩土力学, 2020, 41(2): 552-560.
[6]	朱彦鹏, 陶钧, 杨校辉, 彭俊国, 吴强, . 框架预应力锚托板结构加固高填方边坡设计与数值分析[J]. 岩土力学, 2020, 41(2): 612-623.
[7]	程昊, 唐辉明, 吴琼, 雷国平. 一种考虑水力滞回效应的非饱和土弹塑性扩展剑桥本构模型显式算法有限元实现[J]. 岩土力学, 2020, 41(2): 676-686.
[8]	翁永红, 张练, 徐唐锦, 黄书岭, 丁秀丽, . 高水头下大型导流洞新型堵头-围岩相互作用规律与安全评价[J]. 岩土力学, 2020, 41(1): 242-252.
[9]	刘丽, 吴羊, 陈立宏, 刘建坤, . 基于数值模拟的湿润锋前进法测量精度分析[J]. 岩土力学, 2019, 40(S1): 341-349.
[10]	刘顺青, 黄献文, 周爱兆, 蔡国军, 姜朋明, . 基于随机块石模型的土石混合边坡稳定性分析方法研究[J]. 岩土力学, 2019, 40(S1): 350-358.
[11]	丑亚玲, 黄守洋, 孙丽源, 王莉杰, 岳国栋, 曹伟, 盛煜, . 基于冻融作用的氯盐渍土−钢块界面力学模型[J]. 岩土力学, 2019, 40(S1): 41-52.
[12]	陈宇龙, 内村太郎, . 基于弹性波波速的降雨型滑坡预警系统[J]. 岩土力学, 2019, 40(9): 3373-3386.
[13]	王冲, 胡大伟, 任金明, 周辉, 卢景景, 刘传新, . 侵蚀性环境对地下结构渗透和力学特性影响研究[J]. 岩土力学, 2019, 40(9): 3457-3464.
[14]	聂秀鹏, 逄焕平, 孙志彬, 谢松梅, 侯超群. 三维加筋边坡地震稳定性上限分析[J]. 岩土力学, 2019, 40(9): 3483-3492.
[15]	韩钢, 周辉, 陈建林, 张传庆, 高阳, 宋桂红, 洪望兵, . 白鹤滩水电站层间错动带工程地质特性[J]. 岩土力学, 2019, 40(9): 3559-3568.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed